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authorAndy Whitcroft <apw@shadowen.org>2008-06-26 19:55:58 +1000
committerPaul Mackerras <paulus@samba.org>2008-07-01 11:28:56 +1000
commit016b33c4958681c24056abed8ec95844a0da80a3 (patch)
tree67ba81cb6bc980119fab4eee15f09488e5777012 /arch/powerpc/Kconfig
parent03d70617b8a789c3721afaafde06fcbba7c7ebf1 (diff)
powerpc: Add 64 bit version of huge_ptep_set_wrprotect
The implementation of huge_ptep_set_wrprotect() directly calls ptep_set_wrprotect() to mark a hugepte write protected. However this call is not appropriate on ppc64 kernels as this is a small page only implementation. This can lead to the hash not being flushed correctly when a mapping is being converted to COW, allowing processes to continue using the original copy. Currently huge_ptep_set_wrprotect() unconditionally calls ptep_set_wrprotect(). This is fine on ppc32 kernels as this call is generic. On 64 bit this is implemented as: pte_update(mm, addr, ptep, _PAGE_RW, 0); On ppc64 this last parameter is the page size and is passed directly on to hpte_need_flush(): hpte_need_flush(mm, addr, ptep, old, huge); And this directly affects the page size we pass to flush_hash_page(): flush_hash_page(vaddr, rpte, psize, ssize, 0); As this changes the way the hash is calculated we will flush the wrong pages, potentially leaving live hashes to the original page. Move the definition of huge_ptep_set_wrprotect() to the 32/64 bit specific headers. Signed-off-by: Andy Whitcroft <apw@shadowen.org> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/Kconfig')
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